The Oki 42918105 Yellow Compatible Drum Unit delivers fast, consistent and outstanding printouts. All these benefits are also coupled by the fact that this drum unit is a considerably cheaper price compared to the original Oki drum unit. This is achieved when a third party manufacturer uses recycled material, to build a robust and premium quality product designed for the budget conscious customer. This particular drum unit is has a page lifespan of up to 30,000 pages. This compatible Oki drum unit can easily be changed out and also easily installed in the specific Oki printers. It is also backed for up to a full year by a solid 100% guarantee.